Fig. 12: Heat Discoloration
Courtesy of GENERAL MOTORS CORP.
Heat discoloration ranges from faint yellow to dark blue. This discoloration results from overload or an
incorrect lubricant. Excessive heat causes softening of the races or the rollers. In order to check for loss of
temper on the races and the rollers, perform a file test. A file drawn over a tempered part will grab and cut the
metal. A file drawn over a hard part will glide readily with no metal cutting. Replace the bearings if overheating
damage is indicated. The tempered part will fail the file test. Check the seals and the other related parts.
Misalignment
2004 Hummer H2
2004 DRIVELINE/AXLE Front Drive Axle - Hummer H2